Their latest effort, Summit Entertainment’s prison break movie “Escape Plan,” was a disappointment when it opened to less than $10 million domestically last month. But the studio reported Monday that it’s up to $63 million at the foreign box office, not bad considering Stallone is 67 years old and Schwarzenegger is 66.

Stallone’s movies have brought in $2.9 billion at the worldwide box office since he stepped into the ring for “Rocky” back in 1976 and Schwarzenegger’s have totaled $3.8 billion since he appeared in “Stay Hungry” that same year. But Arnold’s “The Last Stand” opened to a dismal $6.2 million in January, and Sly’s “Bullet to the Head” did even worse, debuting to $4.5 million in February.

Schwarzenegger, two years removed from his stint as California’s governor, is set to start shooting a reboot of “The Terminator” in April for Paramount. And Stallone will be back on the big screen at Christmas with Robert De Niro in the Warner Bros. comedy “Grudge Match.”